[LAU] How to combine separate video and audio tracks together?

[david]

I've done nothing with video except play them from YouTube.

I've noticed that YouTube separates HD1080 video from the audio tracks, 
meaning I can't just download the HD1080 vid and watch it comfortably 
using my USB sound card. But I can download the HD1080 vid and the audio 
track separately.

Ideas? Thanks.

-- 
David W. Jones
gnome at hawaii.rr.com
authenticity, honesty, community
http://dancingtreefrog.com